| Abbreviation | Definition |
|---|---|
| CTTC | Centre Tecnològic de Telecomunicacions de Catalunya |
| CTTIC | China Transport Telecommunication & Information Center |
| CTTS | Cable Telecommunications Training Services |
| CTTX | Connect to the X or anything |
| CTUF | Cape Telecommunications Users Forum |
| CTUF | Cape Telecommunications Users' Forum |
| CTUF | Cape Telecommuniucatiions User Forum |
| CTWU | Chunghwa Telecom Workers Union |
| CU | Channel Unit |
| CUA | Call Unit Autodialer |
| CUCM | Cisco Unified Communication Manager |
| CUG | Closed Users Group |
| CUSA | Central Urban Service Area |
| CV | Coding Violation |
| CVT | Circuit Validation Test |
| CWC | Center Weight Control |
| CWTS | China Wireless Telecommunication Standard |
| CWTS | China Wireless Telecommunication Standards |
| CWTS | Chinese Wireless Telecommunication Standard |
| CYTA | CYprus Telecommunications Authority |